that was the first time for us also. we were told in standing starts they break same place.
i am guessing it's where the axle spline stops and the hub continues to the nut. that splined area of emptiness between the axle and the nut is where it broke. this is only a guess will know for sure after we examine everything closer and with new pieces.
p.s. i hope you guys understand what i'm trying to say. no pics yet. but there was a lot of people taking pictures maybe someone can post some pics.?????